package com.zkk.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.zkk.reggie.common.BaseContext;
import com.zkk.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否登录的过滤器
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        String[] urls = new String[]{

                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg", //移动端发送短信
                "/user/login"   //移动端登录
        };

        boolean check = check(urls, requestURI);

        if (check){
            filterChain.doFilter(request,response);
            return;
        }

        //判断后台用户登录状态
        if (request.getSession().getAttribute("employee") != null){

            //把ID放入当前线程副本ThreadLocal
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //判断移动端用户登录状态
        if (request.getSession().getAttribute("user") != null){

            //把ID放入当前线程副本ThreadLocal
            Long empId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }


        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){

        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }


}
